Glue gun



Nov. 16, 1954 R. c. WARREN GLUE GUN Filed Oct. 2, 1948.

INVENTOR.

afer C. hheEN United States Patent C) GLUE GUN Robert C. Warren, Los Angeles, Calif., assi'gnor to John P. Fox, Studio CityrCalif.

Application October 2', 1948, Serial No. 52,507

6-Claims.= (Cl; 15-127)v This invention relates-to liquidejectors, typified: by a gun for dispensing-liquidor plastic adhesive material suchas glue, and pertains'particularly to such units which are operated by compresse'ziv airZ andcontain a valve adapted to-releasefthe glue intermittently as' the nozzle is applied to successive workpeces.

Itis an object of the invention to provide such a'glue gunwhich releases glue upon` pressure of the nozzle against a workpiece. Such a nozzle can be held'in the hand and moved from one: point of application to` another without the glue dripping'between ejections. The nozzle is particularly adapted to supplyv glue or other adhesiveto the sidesof indentures in-the workpiece such asdowelholes,grooves'or joints, etc., which is more effective than' flooding the'floor of: the opening with thev adhesive before inserting the dowel or panel to' be attached.

Other objects and advantages-,of' the invention will be apparent from the following-description and claims, the novelty'consisting in'the features of construction,

combinationof parts,v the unique relations of the members and-the relative proportioning; disposition, and operationlthereoflall as more completely outlined herein and particularly pointed outin the; appended claims.

In the drawings, .which .form-part-of'the present specification:

Figure 1 is a.verticalsectional-view of va-portable hand pump and glue container connected-.to one form of' my glue gun, shown in side elevation;`

Figure 2 is an enlarged viewofthe glue-.gun-ofFigure 1, shown in longitudinal-section;

Figure 3 is .a.detail-vievwofthe:nozzle of the glue-guni of the preceding figures, inserted in-operatingfposition in adowel hole;

Figure 4 shows anotherform of myr glue' gunwiththe valve sectionishown inlongitudinal section land the nozzle seen in side elevation in' a glue; and

Figure 5 is an end view-of` the. nozzle of Figure 4 in working position ina-groove.

My 'glue'gun10-is-particularly adapted to -be attached grooveto-which it delivers;

to a flexible glue conduit 12.so thatfitcan-be graspedt 1 in the hand anddrawnalong a'grooveor' inserted in successive dowelholes or.the liketovwhichfit'is desired to deliVer-glue. Alternatelyhoweverit maybe mounted on a rigid 'conduitand-the..workpiecesmoved-in relation to` the glue 'nozzle if' desired.

The glue gun isadaptedforuse-;with a sourceof'glue under pressure so that intermittent release of the valve in the nozzle end lof the gun will allowthe glue to fiow out the nozzle. Opening of the., valve.. is eifected by pressure of the nozzle against the workpiece as will be'V explained shortly. As illustrated in Figure 1, the gun 10 by its feed conduit 12; isconnected to -a-portable container 14 which holds glue-16' in its lower portion and has an air Chamber 18 abovevthe level of the glue.

A' tnbular'neck 20 arises centrally-'from'the air chamber and in communication therewith, and serves to house a reciprocatingiv piston 22 connected at its upper face to a piston rod 24 which extends upward thru the cylinder cap 26 and its guide boss 28 to the exterior Where it tion.

2,694,2ll Patented Nov. 16, 1954 ICC 2 when the valve 38'isclosed. Thus by pumping the lever 30' for a short time, a considerable air pressure can be built up in'theechamber 181which acts against the upper surface of the glue 16 to force it thru the conduit 12 whenever the glue is` allowed'to pass out the nozzle. In this connection it should be' noted thatthe air is not mixed'with the glue-the glue is not sprayed outand it isnot necessary to pump the lever 30 at thev same time that the glue is being released from the gun. Alternately, of course, suitable stationary' and/or automatic sources of pressurizedfluid can be used in place ofV the portable hand pump.

In-the form'of gluegun 10 illustrated in Figures 1'-3, there is provided an'elongated handle 42 centrally relieved at 44 for grasping, and drilled from each end to provide a continuous longitudinal passage for the glue therethru, having a principali bore: 46 extending thru most of the body and'generallyz'correspondinging-in diameter to the supply line'12, and'a' smaller' Outlet' or terminal bore 48. The: inlet end` may. beinternally threaded at 50-to receive 'theend of the'supply line which is here equipped with a lock nut 52.

The further, tapered end`54offthe handleeis provided with a centered, open-ended; internally threadedfsocket 56 within which different sized'nipples 58 may be mounted. The nipple or nozzle end is'formediwith asthreaded neck 60 dimensioned for reception in the socket 56,: a flared shoulder portion 62 adapted to abut againstf the tapered end 54? of the handle; and'fa'ftubular extension 64 having a large longitudinal bore 61 extending'from the attachment end nearly to the. opposite end, and a smaller axial bore 68 vrunning=inward from the free end to join the largerv bore 61;

At the outer end'of' the larger bore 61 its diameter decreases arcuately'to'provide a seat for aball valve 70 which'is held:in"place by.` a helical'spring 72'within the bore, its opposite end pressing against a washer` 73 in the base of the socket 56;' Withinvthe smaller bore 68' and projecting'out from the end thereof1is a striker 74'having a radially enlargedhead'76` disposed within the'end of th'e smaller bore so as to allow it'to press back the ball70: upon further' insertion'of the striker in its-channel and also to'keep the striker| from falling out of the nozzle when it moves' in'the' oppositedirec- Outwardly fromv the ball valve 70 are an opposing pair of-lateral'glue'outlets 78 connected at their months by a peripheral groove'180.Z

Accordingly, wh'en the end'of'the nozzle 58f'is inserted in a dowel hole 82 (Figure 3) to which it'is desired to supply glue, upon' the^striker 74 being pushed'in by contact with the bottom of'the hole, its`head-76presses back theball 70 to allow` glue to `flow around it and thru the Outlet 78, filling the groove V and adhering to the side of the hole 82.' `When the nozzle is withdrawn, the bead'of g'lue about'the groove 80'is wiped of along'the sides of the' dowel hole, which is where it' is desired to'locate'it ratherf'than in the bottom of the hole. Consequently, the nozzle canbe inserted in such-a hole-and wit'hdrawn` almostV immediately, thus proceeding'from one holeto another'with great rapidity and'without drippint: glue between holes. Extern'ally, the tubular-portion' 64'oftthe nozzle maybe of any configuration such as `annular or polygonal to corresponding to the opening 'in which it is desired to deliver glue, and due to its ready attachment and detachmentfrom the handle, it can be provided in aseries of Vdifferent sizes to fit various size dowel holes.

In the embodimentof'the invention illustrated in Figures 4 and 5, there -istprovided a'closed-'end nozzle having a bevelled tip 84 and lateral apertures 86 for delivering glne to the sides ofigrooves'when drawing thetip along a groove 87 on itsv beveled surface. The nozzle is attached to aivalve assembly employing a rigidconduit section 88' and 'a'flexible conduitlsection 90.with an operating rod 92 disposed within the conduit and extending from the rigid section into the fleXible section. A spherical end 94 of the rod within the rigid section is seated in a corresponding socket 96 of a cylindrical boss 98 of an annular valve plate 100 which is normally held seated across the outlet line 102 by a coil spring 104 the other end of which abuts against an internal shoulder 106 of the rigid conduit segment. About the periphery of the valve plate is a segmented or transversely interrupted bead 108 extending radially nearly to the inner face of the conduit. The opposite end of the rigid section is radially restricted at 110 and externally serrated at 112 for attachment thereover of the flexible portion. The free end of the operating rod carries an enlarged knob 114.

Accordingly when the bevelled tip` is pressed against the bottom of a groove 87, movement of the flexible conduit 90 against the knob 114 causes the rod 92 to fulcrum at 110 and its opposite ball end 94 to unseat the valve 100, allowing glue to pass between the bead segments 108 and thru` the escape channel 102 to the outlets 86. As the nozzle is drawn along the groove 87, glue is supplied to the sides thereof, so as to retain for example a panel subsequently inserted in the groove. As soon as bending pressure is released from the nozzle (or more accurately from the fiexible section) the spring 104 seats the valve 100.

It Will thus be seen that I have produced an automatic, hand-manipulated glue gun which has the particular advantage of delivering glue to the sides of a groove or hole of a workpiece in response to the pressure of the nozzle thereagainst. preferred embodirnents are here shown and described in Some detail, it is to be understood that various modifications may be made therein Within the scope of the invention as hereafter defined, it being my intention to claim the invention broadly within the limitations of the prior art.

I claim:

1. In a hand-manipulated glue gun having a flexible conduit connected to a source of glue under pressure, a handle having a longitudinal passage therein, one end of said passage being connected to Said conduit, a tubular nozzle connected to the other end of said handle, said handle and said nozzle being substantially coaxial, the free end of the nozzle being formed with a groove extending around at least a portion of the nozzle periphery and communicating through an orifice with said pas- Sage so as to provide an outlet for glue, means defining a valve seat between Said orifice and said conduit, a check valve ball disposed within said nozzle on the high pressure side of said valve seat and resilient means disposed normally to urge said ball seated against said valve seat so as to prevent outward passage of glue therethrough, and a longitudinally displaceable Striker projecting generally axially from the free end of the nozzle, the inner end of said Striker being positioned to engage said ball to unseat same from said valve seat upon the Striker being pressed into the nozzle by engagement with a work piece.

2. In a hand-manipulated glue gun having a fiexible conduit connected to a source of glue under pressure, a handle having a longitudinal passage therein, one end of said passage being connected to said conduit, a tubular nozzle connected to the other end of said handle, said handle and said nozzle being Substantially coaxial, the free end of the nozzle being formed With a circular groove in the side wall thereof and a plurality of orifices that establish communication between said passage and said groove So as to provide a plurality of outlets for glue. means defining a valve seat between said orifices and said conduit, a check valve between said orifices and said conduit, said check valve normally being closed so as to prevent outward passage of glue therethrough, and a movable striker projecting outwardly from the free end of the nozzle and having its inner end adapted to open said valve when the outer end of said Striker engages a Work piece.

3. In a glue gun having means for delivering glue under pressure, a tubular nozzle for dispensing such glue, one end of said nozzle being adapted to receive glue under pressure, the other end of the nozzle being formed with a peripheral groove and an orifice proividing communication between said groove and the interior of said nozzle so as to provide an outlet for glue, a check valve between While two presently said orifice and said one end, said check valve normaliy eing closed so as to prevent outward passage of glue therethrough, and a movable Striker projecting outwardly from the free end of the nozzle and having its inner end adapted to open said valve when the outer end of said Striker engages a work piece.

4. In a hand-manipulated glue gun, having means for delivering glue under pressure, a tubular nozzle having a passage extending thereinto from one end thereof, said one end being adapted to receive glue under pressure, the nozzle having a plurality of lateral orifices spaced about the periphery thereof and between the ends of said nozzle, said orifices communicating with said passage so as to provide a plurality of outlets for glue, the passage being enlarged between said one end and said orifices to form a valve seat therein, a check valve ball disposed within said nozzle on the high pressure side of said seat, resilient means for urging said ball into seating engagement with said valve seat so as to prevent outward passage of glue therethrough, said nozzle being formed With a reduced bore at the other end thereof, and a Striker extending through said reduced bore into said passage and provided with an enlarged head at the inner end thereof, said strikcr being movable into and out of said passage, said Striker' unseating said ball from said seat to permit outward passage of glue therethrough when said Striker is pressed into said passage.

5. In a hand-manipulated glue gun, having means for delivering glue under pressure, a tubular nozzle having a passage extending thereinto from one end thereof, said one end being adapted to receive glue under pressure, the nozzle being formed with a peripheral groove on the side thereof and an orifice providing communication between said groove and said passage so as to provide an outlet for glue, the passage being enlarged between said one end and said orifice to form a valve seat therein, a check valve ball disposed within said nozzle on the high pressure side of said seat, resilient means for urging said ball into seating engagement with said valve seat so as to prevent out- Ward passage of glue therethrough, said nozzle being formed with a reduced bore at the other end thereof, and a Striker extending through said reduced bore into said passage, said Striker being movable into and out of said passage, said striker unseating said ball from said seat to permit outward passage of glue therethrough when said Striker is pressed into said passage.

6. In a hand-manipulated glue gun, having means for delivering glue under pressure, a tubular nozzle having a passage extending thereinto from one end thereof, said one end being adapted to receive glue under pressure, the nozzle being formed with an encrcling groove between the ends thereof and a plurality of orifices that establish communication between said passage and said groove so as to provide an outlet for glue, the passage being enlarged between said one end and said orifice to form a valve seat therein, a check valve ball disposed within said nozzle on the high pressure side of said seat, resilient means for urging said ball into Seating engagement'with said valve seat so as to prevent outward passage of glue therethrough, said nozzle being formed with a reduced bore at the other end thereof, and a Striker extending through said reduced bore and provided with an enlarged head at the inner end thereof, said striker being movable into and out of Said passage, said Striker unseatingsaid ball from said seat to permit outward passage of glue therethrough when said Striker is pressed into said passage.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date l,122,616 Kuebler et al. Dec. 29, 1914 l,l4l,522 Boyaiean June l, 19l5 2,252,432 Klammt Aug. 12, 1941 2,360,582 Richardson Oct. 17, 1944 2,550,840 Martin et al. May l, ll 2,579,l67 Atkinson Dec. 18. 1951 

